Leviton 1222-2W 20 Amp, 120/277 Volt, Toggle Double-Pole AC Quiet Switch, Extra Heavy Duty Grade, Self Grounding, Back and Side Wired, White - Wall Light Switches - Amazon.com
CS220-2W - Leviton CS220-2W - Double Pole Side Wired Switch, 20 Amp, Commercial - White (120/277V)
1221-7PR
How To Wire a 3-Way Switch: Diagrams and Instructions